text: #ifndef _XFS_PNFS_H
  #define _XFS_PNFS_H 1
  
  #ifdef CONFIG_NFSD_PNFS
  int xfs_fs_get_uuid(struct super_block *sb, u8 *buf, u32 *len, u64 *offset);
  int xfs_fs_map_blocks(struct inode *inode, loff_t offset, u64 length,
  		struct iomap *iomap, bool write, u32 *device_generation);
  int xfs_fs_commit_blocks(struct inode *inode, struct iomap *maps, int nr_maps,
  		struct iattr *iattr);
  
  int xfs_break_layouts(struct inode *inode, uint *iolock);
  #else
  static inline int xfs_break_layouts(struct inode *inode, uint *iolock)
  {
  	return 0;
  }
  #endif /* CONFIG_NFSD_PNFS */
  #endif /* _XFS_PNFS_H */
  